Lock-nut.



W. D. GRANNEY.

LOCK NUT.

APPLICATION FILED PEB.17, 1912.

Patented Mar. 10, 1914.

a onion.

WILLARD D. CRANNEY, OF LOGAN, UTAH.

LOCK-NUT.

To all whom it may concern Be it known that I, l l innano D. Cranmer, a citizen of the United States, residing at Logan, in the county of Cache, State of Utah, have invented certain new and useful Improvements in LOClK- ltlt-SZ, and l do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled. in the art to which it appertains to make and use the same.

My invention relates to new and useful improvements in lock nuts and the object of my invention is to improve the construction and increase the efficiency of nuts of the above described character.

A further object of my i struct a lock nut havi a spring pressed locking pawl adapted to engage with the threads of a bolt and so positioned and proportioned that the application of a wrench to the nut will throw the pawl out of operative position. With these and otaer objects in view, my invention will be more fully described, illustated in the accompanying drawings which show a preferred embodiment of my device and then specifically pointed out in the claim which is attached to and forms a part of this application.

In the drawings, Figure 1 is a side elevation of a conventional form of bolt with my improved lock nut applied lJl'lGI'G'lJO. Fig. 2 is a top plan of the nut in locked position. Fig. 3 is a similar view in unlocked position. Fig. 4 is a perspective view of a pawl used herewith.

Referring more specifically to the drawings, in which similar reference numerals designate corresponding parts throughout, l0 designates a conventional form of bolt having the customary nut engaging threads 11 and 12 designates in general my improved lock nut.

Formed in the upper face of the nut and extending from adjacent one corner thereof tangentially to the bolt receiving here is a groove or channel 13 which is flared immediately after passing the bore to form a recess 14L having an arcuate outer bearing face 15. This recess is also extended par- 'tially about the bore in a counterclockwise rention is to con direction as shown at 16. A leaf spring 18 has one end firmly wedged in the groove or Specification of Letters Patent.

Application. filed February 17, 1912.

Patented Mar. to, rare.

Serial No. 678,289.

channel 13 and so held against motion while its free end extends lnto the recess 14: and

bears against the outer face of a. substantially crescent shaped pawl 19 which is pivoted at 90. This pawl has a beveled bifurcated inner teri'ninal 21 adapted to engage by its bifurcations between adjacent threads of the bolt and the opposite terminal of the pawl extends outwardly beyond the face of the bolt in position to he engaged by a wrench when the latter is applied to the nut, said latter terminal being so positioned that the pressure of the wrench will turn the pawl against the action of the spring to disengage it from the bolt. 7

The extended portion 16 of the recess permits great freedom of movement to the spring while the curved bearing face 15 supports the spring and increases the force required to swing the pawl out of engagement and consequently increases the gripping action of the pawl.

From the foregoing description it will be apparent that l. have provided an extremely simple form of lock nut and one which may be readily manufactured at small cost.

In operation the wrench is positioned upon the nut with its jaw or shank engaging against the outer terminal of the pawl, thus holding the pawl in inoperative position. The nut is then turned home in the cus tomary manner and the wrench disengaged therefrom, thereby releasing the pawl which is immediately forced into engagement with the threads of the bolt by the leaf spring.

It will of course be understood that minor changes in the details of construction may, within the scope of the claim, he made if desired without in the slightest degree departing from the spirit of my invention.

lVhat I claim is A nut loch comprising a nut having a recess in its upper face with a flared portion and a reduced extended portion opposite the flared portion, the flared portion of the recess extending through the side of the nut, a crescent shaped pawl pivoted in said recess and having one terminal bifurcated to engage the thread of a bolt upon which the nut is engaged while its opposite rounded terminal normally projects beyond the side of the nut, said pawl being pivoted in the flared portion of the recess, and a leaf spring having one end secured in the reduced extended portion of the recess while its opposite end In testimony whereof, I afiix my signais engaged against the convex face of the ture, in presence of two witnesses. pawl to resiliently retain the bifurcated terr T T T ininal thereof in engagement with the bolt ULLARD ORABBEL 5 threads, said leaf spring being tapered from Witnesses:

end to end whereby it may be wedged tightly J. Z. STEWART, in the reduced portion of the recess. G. H. WISER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

